A 32-mu W 1.83-kS/s Carbon Nanotube Chemical Sensor System
Author(s)Cho, Taeg Sang; Lee, Kyeong-Jae; Kong, Jing; Chandrakasan, Anantha P.
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This paper presents an energy-efficient chemical sensor system that uses carbon nanotubes (CNT) as the sensing medium. The room-temperature operation of CNT sensors eliminates the need for micro hot-plate arrays, which enables the low energy operation of the system. An array of redundant CNT sensors overcomes the reliability issues incurred by the CNT process variation. The sensor interface chip is designed to accommodate a 16-bit dynamic range by adaptively controlling an 8-bit DAC and a 10-bit ADC. A discrete optimization methodology determines the dynamic range of the DAC and the ADC to minimize the energy consumption of the system. A simple calibration technique using off-chip reference resistors reduces the DAC non-linearity. The sensor interface chip is designed in a 0.18-mum CMOS process and consumes, at maximum, 32 muW at 1.83 kS/s conversion rate. The designed interface achieves 1.34% measurement accuracy across the 10 kOmega-9 MOmega range. The functionality of the full system, including CNT sensors, has been successfully demonstrated.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Microsystems Technology Laboratories
IEEE Journal of Solid-State Circuits
Institute of Electrical and Electronics Engineers
Taeg Sang Cho et al. “A 32- \mu W 1.83-kS/s Carbon Nanotube Chemical Sensor System.” Solid-State Circuits, IEEE Journal of 44.2 (2009): 659-669. © 2009 Institute of Electrical and Electronics Engineers
Final published version
INSPEC Accession Number: 10459100
carbon nanotube (CNT), chemical sensor system, low power, sensor interface